Thumbs up [Q] My App is not visible when we search with its name in Google Play

Hi All,
We have developed a Sudoku App and posted in Google play few days back. As of now we got nearly 450+ downloads by promoting it in AdMob. But when we search with its name in Google Play the App is not visible in search result. Where as few similar apps with 50+ downloads are appear in Google Play. Please any one suggests what I should do to make it visible in Google play search.

Please find below is my free App link from Google Play.

Thanks,
Regards,
Srinivas.